Valve.



' J. 0. EVANS.

Patented Nov. 23, 1909.

UNTTED STATES PATENT ()FFICE.

JOSHUA C. EVANS, OF YOUNGSTOWN, OHIO.

VALVE.

T 0 all whom it may concern:

Be it known that I, JOSHUA G. Evans, citizen of the United States,residing at Youngstown, in the county of Mahoning and State of Ohio,have invented new and useful Improvements in Valves, of which thefollowing is a specification.

My invention relates to improvements in suction or inlet valves ofgasolene motors, and at present the nut of such a valve is threaded onto the stem. During the operation of the motor, the pressure on the nutis often such as to strip it from the stem, permitting the valve andstem to drop into the cylinder of the engine.

One object of my invention is the provision of a suction or inlet valvewherein the nut is secured to the stem against accidental displacementin an outward direction.

"With the above and other objects in view, the invention consists in theconstruction, combination and arrangement of parts hereinafter fullydescribed and claimed, and illustrated in the accompanying drawing,wherein Figure 1 is a sectional view illustrating my invention. Fig 2 isa detail sectional view of the nut. Fig. 3 is a detail sectional View ofthe key by which the nut is secured to the valve stem against accidentaldisplacement, and Fig. 4c is a fragmentary portion of the outer end ofthe valve stem, illustrating the head through the medium of which thekey is secured to the valve stem.

Referring to the drawing by reference numerals, 1 designates the stem ofthe suction or inlet valve of a gasolene motor. At a point near itsouter end, the stem 1 is circumferentially reduced to provide aninverted conical head 2. The greatest transverse dimension of the head 2is smaller than the transverse dimension of the stem 1, whereby topermit a nut 3 to be applied to and removed from the stem. The nut 3 isprovided with an inner cylindrical bore t which snugly receives the stem1, with an outer cylindrical bore 5 which is larger in diameter than theinner bore a and which receives a wear block 6, and with an intermediatetapered bore 7 which extends from the inner end of the inner bore 4: tothe inner end of the outer bore 5 and which receives a key 8. The key 8secures the nut 3 upon the stem 1 against accidental displacement, andit comprises two semi-cylindrical members 8 and 8 which are applied tothe head Specification of Letters Patent.

Application filed April 24, 1909.

Patented Nov. 23, 1909.

Serial No. 491,981.

2 of the stem 1. The inner sides 9 of the members of the key 8 areinclined to correspond with the inclination of and engage the side ofthe head 2, and the lower portions 10 of the outer sides of said membersare inclined to correspond with the inclination of and engage the innerwall of the intermediate bore 7 of the nut 3. The upper portions 11 ofthe outer sides of, the members of the key '8 are straight to correspondwith and engage the wall of the outer bore 5 of the nut 3. As the outerbore 5 of the nut 3 is larger in diameter than the stem 1, the membersof the key 8 may be readily and quickly applied to and removed from thehead 2 in a manner that should be apparent. At a point adjacent itsouter end, the nut 3 is provided with an annular flange 12 against theinner side of which the outer end of an expansible coiled spring 13bears, the flange being provided with an annular recess 1.41: for thereception of said outer end of the spring.

When the suction or inlet valve is in ap plied position, the spring 13exerts a constant tension on the flange 12 of the nut 3, such tensionretaining the parts in the positions shown in Fig. 1 of the drawing. Thewear block 6 engages the cam of the crank shaft and prevents the samefrom wearing the outer ends of the stem 1 and nut 3.

From the foregoing description, taken in connection with theaccompanying drawing,

it should be apparent that I provide a suction or inlet valve whereinthe nut is secured to the stem against accidental displacement in anoutward direction, one wherein the nut may be readily and quicklyapplied to and removed from the stem, and one which may be manufacturedand sold at a comparatively low cost.

While I have described the method of operation of the invention,together with the apparatus which I now consider to be the bestembodiment thereof, I desire to have it understood that the apparatusshown is merely illustrative and that such changes may be made whendesired as are within the scope of the claims.

Having thus described the invention, what I claim as new is 1. Incombination, a stem, a nut secured to the stem, and a wear block carriedby the nut.

2. In combination, a stem provided with a conical head, a nut providedwith a bore std receiving the stem, and with a tapered bore,

and a key inserted between the head and the Wall of said tapered bore.

3. In combination, a stem provided with a conical head, a nut providedwith an inner bore receiving the stem and with an outer bore and with atapered intermediate bore, a key inserted between the head and the wallof said tapered bore, and a wear block inserted in the outer bore.

4. In combination, a stem provided with a head, a nut provided With aninner bore receiving the stem, said nut being provided with an outerbore larger than the inner bore and with an intermediate bore, and a 15key inserted between the head and the wall of said intermediate bore.

In testimony whereof I affiX my signature in presence of two Witnesses.

JOSHUA C. EVANS. WVitnesses i T. EVANS, WV. C. BREWER.

